Outlook "Classic" issues

Without any changes being made to my system, I am suddenly getting the following error message when trying to send/receive mail.

Task 'email address removed for privacy reasons: Folder:Inbox Check for new mail.' reported error (0x800CCC0E) : 'Outlook cannot download folder Inbox from the IMAP email server for account email address removed for privacy reasons. Error: Cannot connect to the server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).'

I have followed all of the suggested solutions that I could find including editing the registry but nothing is working. Hope someone can help as thjis is a big problem for me.